Yunqing Meng, Xian Dong, Chuang Wu, Jie Li, Baiou Guan. Fabrication and Refractive Index Sensing Characteristics of Exposed-Core Side-Hole Fiber Bragg Grating[J]. Laser & Optoelectronics Progress, 2022, 59(1): 0106003
- Laser & Optoelectronics Progress
- Vol. 59, Issue 1, 0106003 (2022)
Fig. 1. Diagram of side hole fiber. (a)(b) SEM photos of cross-section and core of side-hole fiber; (c)(d) diagram of Bragg grating and corresponding transmission spectrum
Fig. 2. Diagram of optical fiber side polishing system
Fig. 3. Reflection spectra of the D-shaped SH-FBG. (a) Diagram of reflection spectra before and after polishing, inset is the corresponding SEM photo of fiber end view; (b) reflection spectra of the sensor at different refractive index
Fig. 4. Refractive index and temperature response characteristics of D-shaped SH-FBG sensor. (a) FBG wavelength as function of the refractive index; (b) FBG wavelength as function of the temperature
Fig. 5. Diagram of chemical etching setup
Fig. 6. Refractive index response characteristic of X-shaped SH-FBG. (a)‒(c) Change of reflection spectra of the sensor under different refractive index under different corrosion time; (d)‒(f) refractive index response corresponding to the reflection wavelength
Fig. 7. Temperature response characteristics of X-shaped SH-FBG. (a)‒(c) Relationship between FBG wavelength and temperature corresponding to spectra in Fig. 6 (a)‒(c)
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Table 1. Comparison of refractive index sensitivity of FBG with different exposed-core microstructures
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